Think of this, there are places on the earth today where the sun never sets, and other places where it won't rise. As the year progresses it will set and rise almost north near the north pole and the points of rise and set will slide south until it doesn't show at all.?ÿ
@jamesf1 I use this app to preview how the sunrise/sunset will light the terrain for any given location/date/time
https://www.photoephemeris.com/tpe-3d
If anyone remembers the game show Newlyweds they asked the question ??In your neighborhood does the sun rise in the east or the west?. ?ÿThe man answered in the east and the women said west. ?ÿShe ended up saying ??the sun comes up in the west in our neighborhood honey?.
If anyone remembers the game show Newlyweds they asked the question ??In your neighborhood does the sun rise in the east or the west?. ?ÿThe man answered in the east and the women said west. ?ÿShe ended up saying ??the sun comes up in the west in our neighborhood honey?.
I distinctly remember that episode.?ÿ Bob Eubanks asked the wives that question..and then added something like, "Remember ladies, we're talking in about your neighborhood specifically.."
Of course all the men that said the sun came up in the east were 'wrong'. It was a tribute to the age old collision of the yin and the yang... 😉
@david-livingstone Do you remember if the wife worked as a county deed recorder?
Yes she did before she went to the GIS department.?ÿ
You do realize that since Galileo's time that we have known that the Sun does not move relative to us planets right?
You do realize that since Galileo's time that we have known that the Sun does not move relative to us planets right?
Actually the center of gravity of the solat system-the barycenter-depends on the current position of the planets, especially Jupiter, and can lie outside the sun. So the sun wobbles a bit.
https://spaceplace.nasa.gov/barycenter/en/
Some day I'm going to find a course, perhaps at a college art department, that will teach me to draw decent pictures of things like the problem discussed in this thread. Then I'm going to claim it as continuing education for my PE license.
I use a miniature globe and real or imagined light source to help visualize these situations. The free program Stellarium also helps with the views from a chosen location.
For basic concepts, good illustrations, and formulas that are good to arc minute accuracy there are celestial navigation books such as Bowditch.
The Earth/Moon system is also orbiting around a center "point". This point is under the surface of the Earth much closer to the surface than the center of Earth mass.
This causes a wobble in the Earth's path as the Earth/Moon system orbits the barycenter of the solar system. The math to calculate the positions can be done using Newtonian/Keplerian physics, to get into the more complex ideas of gravity and space-time you have to move to relativistic math.
Think of the orbits of GPS satellites, they are pulled and pushed by forces that are very complex, the sun, the earth, the moon, Jupiter, Solar System planets, even by extra solar system mass. Making precise locations of them at any point in time almost impossible.